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Lookup NU author(s): Professor Adrian ReesORCiD
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This paper proposes a spiking neural network (SNN) of the mammalian subcortical auditory pathway to achieve binaural sound source localisation The network is inspired by neurophysiological studies on the organisation of binaural processing in the medial superior olive (MSO) lateral superior olive (LSO) and the inferior colliculus (IC) to achieve a sharp azimuthal localisation of a sound source over a wide frequency range Three groups of artificial neurons are constructed to represent the neurons in the MSO LSO and IC that are sensitive to interaural time difference (ITD) interaural level difference (ILD) and azimuth angle (theta) respectively The neurons in each group are tonotopically arranged to take into account the frequency organisation of the auditory pathway To reflect the biological organisation only ITD information extracted by the MSO is used for localisation of low frequency ( < 1 kHz) sounds for sound frequencies between 1 and 4 kHz the model also uses ILD information extracted by the LSO This information is combined in the IC model where we assume that the strengths of the inputs from the MSO and LSO are proportional to the conditional probability of P(theta vertical bar ITD) or P(theta vertical bar ILD) calculated based on the Bayes theorem The experimental results show that the addition of ILD information significantly increases sound localisation performance at frequencies above 1 kHz Our model can be used to test different paradigms for sound localisation in the mammalian brain and demonstrates a potential practical application of sound localisation for robots (C) 2010 Elsevier B V All rights reserved
Author(s): Liu JD, Perez-Gonzalez D, Rees A, Erwin H, Wermter S
Publication type: Article
Publication status: Published
Journal: Neurocomputing
Year: 2010
Volume: 74
Issue: 1-3
Pages: 129-139
Print publication date: 22/06/2010
ISSN (print): 0925-2312
ISSN (electronic): 1872-8286
Publisher: Elsevier BV
URL: http://dx.doi.org/10.1016/j.neucom.2009.10.030
DOI: 10.1016/j.neucom.2009.10.030
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